|I love breadcrumbs for 2 reasons. |
1 They allow you to retrace your steps very easily
2 They allow visitors who have arrived at the site to go down one level if the information is not 100% what they where looking for. for example they may be interested in Chrysler, just not that specific model. If your navigation system allows them to go back a stage, they can easily navigate to the model they where interested in.